Re: Sockets: synchronous I/O

[Pradeep Padala <ppadala@xxxxxxxxxxxxxx>]

> > > > Would be really great if someone could give me a hint (or maybe even a 
> > > > little code example? ;) 
> > >
> > > The best hint I can give is not to do such things in kernel in the
> > > first place.
> >
> > Yes, In general it's true that these kind of things shouldn't be done in 
> > the kernel. But, one might want to do this to get better performance or 
> > just for experimenting. If Ingo thought this way, we wouldn't have had TUX.
>
>
> Tux was a nice experiment, until somebody showed that you can get the
> same performance from userspace by using sendfile(). The performance
> argument no longer holds.

Agreed, but I believe there are still some gray areas. For example, 
using multiple streams for transfering a file. Yes, this can be done in 
the user mode, probably as effectively, but doing it in the kernel is 
still an interesting thing to do. Another scenario is to perform data 
transfers as close to wire speeds as possible. I work in high 
performance computing environments, and somethings can be done only by 
tweaking the kernel.

--
Pradeep Padala
http://ppadala.blogspot.com

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